Phase 3 of the study is a randomised trial of strategies for delivering ART to women during the postpartum period (the primary objective) with measurement of secondary outcomes during the postnatal period. Women enrolled in Phase 2 who are breastfeeding their infants will be approached to participate in the trial at the routine postpartum clinic visit (this takes place within 7 days of birth and is the only standard postpartum care for women). After completing Informed Consent #3, women will be interviewed with behavioral and psychosocial questionnaires and undergo phlebotomy for study measurements before randomization.